GDX Usage - Gams

Notes
When this option is used the GDX file is created just at the end of the
GAMS execution so the data written will contain the current values
for all sets, parameters, variables and equations that are on hand at the
end of the GAMS job.
The GDX data for the variables and equations contains the levels,
marginals, lower and upper bounds and scales for each item.
GDX files containing selected items
Selected items may be placed into a GDX file either at compile time or
during execution. The syntax and effects differ so these are discussed
separately.
Execution time selected item GDX file creation
An EXECUTE_UNLOAD command creates a GDX file containing selected
problem data. The data in the GDX file are those present at the time that the
statement is executed. The results of all prior calculations and the most
recent solve for any model will be reflected.
The basic syntax of the statement is
EXECUTE_UNLOAD 'filename', nameditem1,nameditem2, ... ;
The filename argument specifies the name of the resultant GDX file. In
particular, a file with this name is created with the extension .GDX and is
placed in the current working directory. This opens and closes the GDX file
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